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x-y = 2
x = 2 + y .......(2)
subtitusikan
3x - y = 12
3 ( 2 +y ) - y = 12
6 + 3y - y = 12
6+2y=12
2y = 6
y= 3
x = 2 + y
= 2 + 3
= 5
3x-y = 12
x-y = 2
_________ _
2x = 10
x = 5
SUBSTITUSI
x-y = 2
5-y = 2
-y = -3
y = 3